Welcome! I'm very sorry about your sister. It is great that you are taking the dogs. I'm certain they will come to love you as their new dog mommy. I don't have any advice on puppies or birthing as I'm not a breeder. But....I wish you the best. Try to enjoy the puppies once they have arrived. Dogs are so amazing at helping with the grief and healing process. I got Copper soon after my brother commited suicide. Copper has given me a reason to get up many morning since then. I feel very blessed to have such a loving and devoted companion. Best to you.